$ git clone -n https://src.fedoraproject.org/rpms/gnome-js-common.git /var/lib/mock/f45-build-11435-430/root/chroot_tmpdir/scmroot/gnome-js-common
Cloning into '/var/lib/mock/f45-build-11435-430/root/chroot_tmpdir/scmroot/gnome-js-common'...
$ git fetch origin 6d0ec05137d1e62cdb45f901b7fde66126ec8699:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-js-common
 * [new ref]         6d0ec05137d1e62cdb45f901b7fde66126ec8699 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d0ec05 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild